Datasets:
olimiemma
/
MIT-OCW-Transcripts

Dataset card Data Studio Files
xet
 Community
1
text
stringlengths
0
205
So he would get temporal bones
after a subject had passed away
and had donated their
body to science.
And they were useful if he knew
something about the individual,
like if they had
their hearing tested
or if you knew a little
bit about what activities
they liked.
These particular
data are from a human
who is an active hunter,
fired a gun a lot.
And the specimens shown
in the photomicrographs
here are looking
down onto the surface
of the inner ear, or
cochlea, on the left side
and the right side
of the subject.
The bone that's on the
snail shell, or cochlea,
has been thinned away
with a dental drill,
and you can see very
nicely the basal turn.
The apical turn, you can't
really see very well from that,
but you can thin the
apical turn as well.
Sometimes.
It's cut off and thinned
in a different dish.
But anyway, what you're
looking at here--
I should get out my pointer,
so I point a little better.
So this is the very basal end
of the cochlea and spiraling up.
And the human has about 2
and 1/2 or 3 complete turns
of the cochlea.
And this white structure
here is the organ
of Corti sitting on
the basilar membrane.
This specimen is stained with
a stain called osmium, which
stains lipids and especially
myelinated nerve fibers,
so you can see a lot of
myelinated nerve fibers.
They looks like
threads coming out.
And here's some more
threads up here.
And I said the organ
of Corti is here,
but actually, it's completely
gone here on the left side,
and you can see it
begin right about here